Design
The MD-2 and MD-3 rifles are the result of redesigning the FN FAL to use the 5.56x45mm NATO round in place of the FAL's 7.62mm NATO chambering. The MD-2/MD-3 series externally resembles a short-barrelled FAL, but with an M16 magazine. Early MD-1 prototypes retained the FAL-type tilting bolt with a locking shoulder immediately behind the magazine well. This was not found to work well with the 5.56mm round, so subsequent prototypes and the final design incorporated an M16-type 7-lug rotating bolt into the design. The FAL's short-stroke gas piston, which is actuated by gas bled from the barrel via a vent located in the foresight housing, and which impinges upon the separate bolt carrier, is retained. Feeding is from STANAG 4179 M16-compatible magazines. The versions differ in that the MD-2 uses the side-folding buttstock from the FN FAL 'para' variant, while the MD-3 uses the fixed polymer stock of the standard FAL. The MD-2 series contains many FAL-derived parts, some of which remain interchangeable with the original FAL, and others which are modified to suit the new design.
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—Ralph Waldo Emerson (1803–1882)